Are your router management ports currently or restricted?
Authentication bypass leaves subtle footprints. Standard login logs are useless because the attacker never "logged in" incorrectly. You need to look for post-exploitation artifacts.
Beyond the 2018 WinBox flaw, several other vulnerabilities have allowed attackers to bypass authentication or access controls: CVE-2025-6443 Detail - NVD mikrotik routeros authentication bypass vulnerability
Remote attackers can potentially exploit this, and exploit code is known to be public, necessitating immediate patching. 2. CVE-2025-6443: VXLAN Improper Access Control
This bypass affects both the legacy WinBox protocol and the newer REST API/WebFig components that share the same authentication handler. Are your router management ports currently or restricted
Disabling accept-router-advertisements or patching to v7.9.1 / v6.49.8. 3. CVE-2025-6443: VXLAN Source IP Improper Access Control
Disable unused services (IP -> Services). Never expose Winbox or WebFig to the public internet. Use a VPN (WireGuard/OpenVPN) to manage devices remotely. You need to look for post-exploitation artifacts
One of the most critical authentication bypasses in RouterOS history, CVE-2018-14847
Attackers frequently use automated tools to scan the internet for vulnerable MikroTik devices. The attack lifecycle generally looks like this:
: Attackers extracted the file, decrypted the passwords offline, and logged into the device with full privileges. Consequences of Exploitation